Digest for sci.electronics.repair@googlegroups.com - 22 updates in 5 topics

tabbypurr@gmail.com: Nov 21 11:00AM -0800

On Wednesday, 13 November 2019 09:18:14 UTC, Fox's Mercantile wrote:
 
> > That approach is the right one for mil spec kit repairs. It is inappropriate for domestic kit.
 
> > NT
 
> Like I said, you're a hack.
 
like I said you're childish.
Fox's Mercantile <jdangus@att.net>: Nov 21 03:49PM -0600


>>> NT
 
>> Like I said, you're a hack.
 
> like I said you're childish.
 
That's your opinion.
My opinion is that you're hack.
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Cursitor Doom <curd@notformail.com>: Nov 22 09:22AM

On Thu, 21 Nov 2019 15:49:38 -0600, Fox's Mercantile wrote:
 
> My opinion is that you're hack.
 
My opinion is you're Phil Alison and ICTFP.
 
 
 
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Fox's Mercantile <jdangus@att.net>: Nov 22 04:22AM -0600

On 11/22/19 3:22 AM, Cursitor Doom wrote:
> On Thu, 21 Nov 2019 15:49:38 -0600, Fox's Mercantile wrote:
 
>> My opinion is that you're hack.
 
> My opinion is you're Phil Alison and ICTFP.
 
Oh look, the hacks are circling the wagons.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
tabbypurr@gmail.com: Nov 22 03:30AM -0800

On Thursday, 21 November 2019 21:49:46 UTC, Fox's Mercantile wrote:
 
> > like I said you're childish.
 
> That's your opinion.
> My opinion is that you're hack.
 
heh. you said that already.
Jeff Liebermann <jeffl@cruzio.com>: Nov 22 07:54AM -0800

On Sun, 10 Nov 2019 13:37:34 -0000 (UTC), Cursitor Doom
>failed, just the unmistakable smell that *something* has. The device
>still powers up fine and the screen traces are normal, so wtf else goes
>*bang* and smells toxic?
 
You seem to be floundering:
 
1. Are you sure that it was the HP VNA that blew a capacitor or
something? When you removed the case, was it lit up?
 
2. Toxic smells tend to be cause by vaporized electrolye. That
leaves a messy stain which should have been present. If you can't see
the damage, perhaps playing bloodhound and smelling for the damage
might help. Find a vinyl hose, cram it into your nose, and sniff
around the VNA and the shop for the strongest smell. Unless you use
an air freshener (nasal desensitize), you should be able to find the
source many days after it went bang.
 
3. When you tested the electrolytics, did you use both an ESR meter
and a capacitance meter? If the ESR meter doesn't show a problem, the
capacitance meter might.
 
4. Do you have a UV LED flashlight? When tracking down bulging
electrolytic problems on computah motherboards, I sometimes (not
always) can seen the electrolyte residue using a UV flashlight.
 
5. Did you have the AC power switch set for 230VAC or 117VAC?
 
6. Check if the small is coming from a power strip. The MOV's
sometimes go bang.
 
Argh, gotta run...
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
tabbypurr@gmail.com: Nov 21 12:14PM -0800

On Saturday, 16 November 2019 23:46:52 UTC, John-Del wrote:
> On Saturday, November 16, 2019 at 5:05:47 AM UTC-5, stra...@yahoo.com wrote:
 
> > 'lytic caps go bad eventually. After removing the caps for testing you've already run the risk of damaging the board.
 
> Anyone who would ruin a board by removing a cap isn't a professional and shouldn't be playing with it. There is ZERO chance of damaging even a multi-layer board.
 
I'm interested to hear how you remove caps from paper based boards with zero board damage rate. Early paper PCBs are somewhat notorious for tracks coming off when heated.
 
 
NT
tabbypurr@gmail.com: Nov 21 12:17PM -0800

On Sunday, 17 November 2019 00:43:09 UTC, Ralph Mowery wrote:
> them than the labor would pay.
 
> Lets say I just make $ 20 per hour. It may take me 5 minuits to setup
> the capacitor checker and test it.
 
Takes me about 10 seconds. I like to know whether I've found a fault or need to keep looking.
 
 
NT
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 21 12:39PM -0800


> I'm interested to hear how you remove caps from paper based boards with zero board damage rate. Early paper PCBs are somewhat notorious for tracks coming off when heated.
 
A very hot iron wetted with fresh eutectic solder, together with expeditious use of a solder-sucker will pull the solder and loosen the lead without damage. It is the sustained heat that causes the traces to lift.
 
Horses for courses.
 
Peter Wieck
Melroes Park, PA
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 21 12:46PM -0800


> Takes me about 10 seconds. I like to know whether I've found a fault or need to keep looking.
 
Takes me about 10 seconds with the ESR meter, containing a 12 volt battery. Takes a bit longer on the big checker that operates at up to 550 VDC.
 
Which do yo think will give the more reliable results?
 
Peter Wieck
Melrose Park, PA
Fox's Mercantile <jdangus@att.net>: Nov 21 03:53PM -0600

> based boards with zero board damage rate. Early paper
> PCBs are somewhat notorious for tracks coming off when
> heated.
 
If you lack the skills to do this, you're a hack.
It's that simple.
I've been doing this for 50 years now.
I don't lift traces, or break off terminals unsoldering
things.
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
tabbypurr@gmail.com: Nov 22 03:28AM -0800


> Which do yo think will give the more reliable results?
 
> Peter Wieck
> Melrose Park, PA
 
550v will tell you more about leakage, not more about ESR.
 
 
NT
tabbypurr@gmail.com: Nov 22 03:29AM -0800

On Thursday, 21 November 2019 21:53:26 UTC, Fox's Mercantile wrote:
> I've been doing this for 50 years now.
> I don't lift traces, or break off terminals unsoldering
> things.
 
lol. You can't help yourself can you. I didn't even mention what I do or can do.
John-Del <ohger1s@gmail.com>: Nov 22 04:07AM -0800

> > I don't lift traces, or break off terminals unsoldering
> > things.
 
> lol. You can't help yourself can you. I didn't even mention what I do or can do.
 
 
Sure you did. You asked *me* "...how you (meaning me) remove caps from paper based boards with zero board damage rate."
 
This indicates you can't.
etpm@whidbey.com: Nov 21 05:35PM -0800

I'm pretty bsure this is a real long shot. I have looked online but
have not yet found something that will help. So I ask here.
The EPROM reader/programmer arrived yesterday and it works fine.
The UV EPROM eraser should be here in a day or two. Amazon apologized
for the delay. So I can copy the EPROMs just fine but I would really
like the ladder programs so that I can make some changes to the
machine.
I understand that the decompiled ladder will noit have mnemonics
but maybe I can decipher it anyway.
The control in question is a FANUC 3T.
Thanks,
Eric
Clifford Heath <no.spam@please.net>: Nov 22 01:09PM +1100

> The control in question is a FANUC 3T.
> Thanks,
> Eric
 
How in heck do yu expect help with a decompiler when you haven't told
anyone what type of CPU it is?
Bill Martin <wwm@wwmartin.net>: Nov 21 06:33PM -0800

On 11/21/19 6:09 PM, Clifford Heath wrote:
>> Eric
 
> How in heck do yu expect help with a decompiler when you haven't told
> anyone what type of CPU it is?
It's even harder...ladder logic isn't a "cpu machine language" as such,
it's an interpreter running in some native cpu machine language...so
there would be a whole other layer of translation involved in order to
produce anything a human might be able to comprehend. Unless your
computer is made from relays...but why bother.
Fox's Mercantile <jdangus@att.net>: Nov 21 08:33PM -0600

On 11/21/19 8:09 PM, Clifford Heath wrote:
>> Eric
 
> How in heck do yu expect help with a decompiler when you haven't told
> anyone what type of CPU it is?
 
Please try to pay attention.
"The control in question is a FANUC 3T."
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Clifford Heath <no.spam@please.net>: Nov 22 03:22PM +1100

On 22/11/19 1:33 pm, Fox's Mercantile wrote:
>> anyone what type of CPU it is?
 
> Please try to pay attention.
> "The control in question is a FANUC 3T."
 
That's the packaged controller.
It contains a CPU.
The CPU interprets some ladder codes.
 
It's highly unlikely that the information required to decode the EPROM
has ever been published. This sort of thing is usually trade secret.
 
If the CPU is known, and the interpreter ROM is read, there's some
possibility of using a decompiler.
whit3rd <whit3rd@gmail.com>: Nov 21 11:59PM -0800

On Thursday, November 21, 2019 at 8:23:03 PM UTC-8, Clifford Heath wrote:
 
> >> How in heck do yu expect help with a decompiler when you haven't told
> >> anyone what type of CPU it is?
 
> > "The control in question is a FANUC 3T."
 
A manual found online says the 3T master board uses an 8086, so it'll decompile
as an 8088 would (different bus, but same opcodes).
pbzcbfzragvf@gmail.com: Nov 21 01:41PM -0800

It's a 12V input, polarity not shown.
 
https://pisces.bbystatic.com/BestBuy_US/images/products/9844/9844485cv1a.jpg
 
The specs in the manual claim that the operating power is 30W.
tabbypurr@gmail.com: Nov 21 10:59AM -0800

On Wednesday, 13 November 2019 09:48:15 UTC, Beeper wrote:
 
> Cannot afford Samsung toner.
 
> I use Amazon to order.
 
> Thank you.
 
that's what ebay's seller percentage rating is for.
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